Angular velocity/angular acceleration calculator, torque estimator, and combustion state estimator

a technology of angular acceleration and calculator, which is applied in the direction of instruments, electrical control, force/torque/work measurement apparatus, etc., can solve the problems of durability and cost, the method of japanese patent application laid-open no. 2005, and the inability to calculate an angular acceleration. to achieve accurate estimation of the combustion sta
US7958779B2Active Publication Date: 2011-06-14MITSUBISHI ELECTRIC CORP
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Patent Information

Authority / Receiving Office
US Β· United States
Patent Type
Patents(United States)
Current Assignee / Owner
MITSUBISHI ELECTRIC CORP
Publication Date
2011-06-14

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Abstract

An angular velocity / angular acceleration calculator of the crankshaft in an internal combustion engine includes a crank angle detection device, a crank angle correction device, and an angular velocity / angular acceleration calculation device. The crank angle detection device detects a crank angle in the internal combustion engine and a time at the crank angle. The crank angle correction device corrects the crank angle and the time thus detected to an equiangular crank angle and a time corresponding thereto. The angular velocity / angular acceleration calculation device calculates an angular velocity and an angular acceleration of the crankshaft by converting a function of the time with respect to the crank angle that are corrected by the crank angle correction device so as to be regarded as a periodic function, and utilizing the discrete Fourier transform of the converted function.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to angular velocity / angular acceleration calculators, torque estimators, and combustion state estimators, and particularly relates to an angular velocity / angular acceleration calculator, a torque estimator, and a combustion state estimator for an internal combustion engine.

[0003] 2. Description of the Background Art

[0004] Highly accurate control of an internal combustion engine is effectively realized by measuring a combustion state of the engine and controlling the engine with a measurement result thereof being fed back. For such highly accurate control, it is important to precisely measure the combustion state of the engine. The combustion state of the engine can be measured by measuring an internal pressure of a cylinder with a cylinder internal pressure sensor to calculate a torque, or by estimating a gas pressure torque according to a crank angle sensor signal.

[0005] Japanese Patent Appli...

Claims

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